Everybody knows

"I... I... I dont know... if I can...." Hermoine frowned and fretted. "An experienced older woman...."

Harry took in Hermoine's troubled look and decided to remove any resistance caused by stupid 'moral' reasons.

"Hermoine, everybody know that witches are into witches. Everybody knows girls find girls sexy. Everybody knows theres nothing wrong with two birds getting it on. Fingering, licking, grinding, toys... its all okay." Harry whispered into her ear.

Hermoine whined and nodded her head her breathing coming in great pants of excitement. "Bu-bu-but Professor McGonagall! Wh-what if I disappoint her?"

Harry rolled his eyes. Of course that would be the thing that Hermoine was really worried about. But it did give him a chance to handle his own possible inadequacy. For all his talk he hadn't slept with anyone yet. Better to cover his bases now.

"No one will judge anyone Hermoine. Everybody knows sex isn't about that. As long as you try to please your partner in the end nobody cares if it takes a few tries." Harry figured that should cover his bases if he turned out to be a bad lay.