Dreams...or reality? How can one be sure?

“Miss Granger! What on earth are you doing?!” Snape yelled, stopping Hermione in her tracks. Her blood ran cold as she turned around to face her professor.
“Sir, I was just headed to-“Hermione started to say when Snape cut her off.
“Detention, 6 o’clock, my office, Granger. Now I suggest you get to your common room before I decide to deduct points,” Snape growled, enjoying the way his presence unnerved the feisty know-it-all.
“But-“
“A week and 20 points from Gryffindor.” Snape said, smirking at the look of indignation on Hermione’s face.
Hermione opened her mouth to protest, then thought twice and closed it. “Yes, Professor,” was all she said.
Snape nodded, satisfied, then turned on his heels and stormed away, his black robes billowing behind him.
“Bloody hell! What a snarky git!” Hermione exclaimed loudly before turning in the opposite direction toward the Gryffindor common room.
Hermione stomped up to the girls’ dormitory. She walked into the bathroom and locked the door behind her. She stripped and slid herself into the tub. She laid her head against the side and closed her eyes. Thoughts zipped through her mind, thoughts of Snape, Harry, Ron, her parents. Things got fuzzy and before she knew it, Hermione had drifted off to sleep.
Hermione immediately found herself immersed in a very stimulating dream.

“You like that, huh? You little slut, you like my hard dick inside you?” Snape moaned out, thrusting himself deeper inside of Hermione’s hot, wet cunt. He lowered his mouth to her neck and viciously claimed it as his own, leaving bite marks on almost every inch of it.
Hermione sat on Snape’s desk in the classroom, her blouse ripped open and her bra pushed angrily aside. Hermione’s skirt was hiked up over her hips and her knickers pushed down, allowing Snape access to every part of her body easily.
“Answer me, you filthy whore! You like your professor’s hard cock inside your dirty little body, don’t you?!” Snape yelled, pulling away from her neck and slapping her face, smiling as a red handprint started to spread across her cheek.
“Yes...Oh good gods yes, Severus!” Hermione cried out, her head falling back as her hips bucked to meet Snape’s thrusts which were coming faster and much harder.
Immediately, though, he stopped, resting his dick inside of her. His eyes glinted maliciously as he roughly grabbed Hermione by her hair.
“What did you just call me?” His lowered voice hissed, sending a shiver through Hermione’s body.
Hermione quickly realized her mistake and lowered her head to her chest. She looked anywhere but at her professor’s gaze, which she could feel boring into her.
“You must be punished, do you agree?” Snape said, his lust quickly fading from his voice.
“Yes, Master. I deserved to be punished for my disobedience to your rules,” Hermione said, her voice low and meek.
“But not now, you must get to class.”
“Class? What do you mean-“Hermione said startled.

Hermione awoke from her dream, still quite groggy and looked around, slightly surprised to find herself still in the tub. The water had long ago turned cold. Pulling her watch from the pile of crumpled clothes beside the tub, she looked at it. 9:27.
Shit! Hermione immediately jumped from the tub and looked around frantically. She had another 15 minutes before her next class, hopefully that was enough to take a shower and primp herself.
She hurried over to the nearest shower stall and jumped in. She washed herself quickly but meticulously, unable to miss a slight pain on her neck and in her core. She brushed the pain aside and turned the water off. She quickly cast a drying spell on herself and hopped out, running into her room. She pulled on her clothes, making sure to put on her matching thong and bra set that Ron liked so much. She looked in the mirror and decided to skip the hair-brushing and she put her hair into a ponytail, a new look for her.
As she looked in the mirror one final time, she could not miss the almost teeth looking marks all over her neck, some more noticeable than others. Her face quickly drained of color. What was she going to tell Ron?! There was no time to think of excuses now, though, she was down to 5 minutes. 5 minutes to get from Gryffindor tower down to the dungeons for double potions. Potions! The dream flooded back into Hermione’s mind as she thought about potions, which was taught by Snape. But it was just a dream right??
2 minutes! Hermione was still dazed and confused as she grabbed her school robes and bag and ran out of the common room and through the corridors until she neared the classroom door in the dungeons. She slowed to a walk and checked herself to make sure she would not have any points deducted for appearance.
She checked her watch before she opened the door, she was 5 minutes late. It didn’t matter what her appearance looked like she was still going to lose her house more points.
Hermione gritted her teeth and opened the door quietly, she stepped inside and was relieved to see that Snape was facing the board. She quickly rushed to her seat beside Ron and sat down, pulling her quill and parchment out quietly.