"But you're all stiff, too..." Noticing how eagerly his hips seem to collide with her hand, the girl presses her fingers into thick denim, intentionally rubbing hard at his bulge. "I don't wanna leave my Oniichan like this..! Doesn't it hurt you?"

Alluka's bumbling fingers eventually find his zipper and pull it undone, knowing it must be hurting him. She had tried on a pair of jeans while hard herself, and they weren't very charitable for space. It shouldn't matter, she reasons, because they're naked around each other all the time!