Press your cock to her slit (and wait)

With your member pressed lightly to her dripping slit, you decide to simply hold it there and gauge her reaction. After a few moments she starts to squirm, her labia brushing your mushroom head with her milky excretions. Each wriggle prying her lower mouth further open and letting you slide the tiniest bit farther in her entrance.

Her obvious impatience is working in your favor as she seems to be desperately trying to get your rod to slide inside her thirsty puss. You decide to work over her nipples some more which elicits a soft gasp from her.

"You're like a big baby," she laughs. "I don't have any milk you know... I've never been..."

"Never been what," you ask already pretty sure you know the answer.

"Um..." she says blushing, "I've never been pregnant..."

"I can fix that if you want sis.."