"Hope you didn't use up all the hot water," he teased, "if that's the case, I might just use some of the water to wake you up tomorrow. Remember that?" He poked fun. He then went to take a shower. About 5 minutes later he returned to the basement. He saw Katherine laying down, he could sneak a peek at her panties from underneath her gown.
I shouldn't, he thought, we just kissed. He couldn't think of her in that way, even though she was positively making his blood boil. "What the hell," he decided quietly to himself. He hadn't masturbated for quite some time after she'd caught him, and he was starting to feel repressed. He started growing an erection as he thought about seeing what lay under that nightgown.
He slipped into the bathroom and starting touching himself. He elected not to jack off in bed after the last incident. He closed the door ever so slightly, not realizing it hadn't shut and could easily be opened. It was pitch black, and he decided to turn on the light. That way, he could flush away the evidence and not catch hell for it from her later.
He stroked himself slowly, closing his eyes to fully engage his imagination. He saw her: radiant, beautiful, starting to remove her gown.