Explain the situation to her

You write about your situation to her in hidden language that you both devised when you were occasionally pissed with Ron. Hoping for the best you send out Errol to Hermione's.

A few days later, Hermione's Owl came back with a reply that they would meet at the library in Leaky Cauldron to check up on a few books on the matter.

She did look concerned but would occasionally peek at your penis.

You explain the situation to her and you both borrow a lot of books on Penis Spells, Orgasmic Explosion and everything related to sex. You noticed that Hermione blushed under G-Spells but walked away. You hid the book under your cloak and then escorted Hermione to your place where you both could discuss this privately. Figg disguised as Tom the Innkeeper made sure no one was near your vicinity.

Out of those books, one of them was Enhancement spells which made it curious for you on why it would be related to sex. But the G-Spell seems nice as well. Maybe... you can mix them both