Impregnate her

Suddenly, one really thin tendril starts to rise from the mass. It gets closer and closer to Hermione until it touches her panties.

Hermione struggles, trying to get free, but she only manages to tire herself to exhaustion, being now completely defenseless, hanging top-down from a monster. Her only option is to just let the creature play with her.

The tendril crawls through her thigh and gets into her panties, where it starts entering her sex immediately. It’s really tight, but the tendril is so thin it goes through without any effort. It goes deeper and deeper until it can no more, and then starts slowly secreting a white and viscous liquid in her womb.

The liquid keeps flowing and flowing, slowly but surely, filling up Hermione's insides. In no time, it's too much and it starts dripping out from her parts, staining her panties. That's when the monster takes the tendril out, satisfied with its work, and lets Hermione hang a bit more, so that its seed penetrates correctly in her womb.