You agree to be partnership.

"I... accept!" You grunt just as a fresh and powerful, for you at least, torrent of cum floods from your cock and into the cunt of this seasoned monster girl. She grunts as her belly inflated a little. Even for a young monster, your cum blast was quite powerful.

"Good, good," She Mutters as she moves off from you and rubs your belly. A few symbols move from her hand and a magical plug enters her pussy, keeping as much of the seed inside as possible, "Now, follow me..."

She gestures to the water before picking up the Rusalka and whirlpool forms. It's slow and oddly calm. She steps in first and you reluctantly follow. With a opening like this, it was even more clear you were dealing with an experienced witch monster and you felt your balls tingle. Said to be a good sign within your species.

Deep within the river was a shack like that of a fishermen's hit and brothel. The Rusalka was already placed on the bed with magical binds for breeding. Another good sign as that was not you in any way, shape, or form.

"Over here," You turned and saw her standing by a set of potions, "now we need to talk about proper business... Feel free to relieve yourself with our new onahole," she said as she pointed to the Rusalka. You licked your lips and immediately made your way over to lay down on her, your cock and balls resting between her great cheeks, cum still leaking from you and her, "now, let's talk potions..."