While Ty and Eileen were making sapphic love, Eileen had allowed some of the semen he had filled Ty with a few minutes ago to seep inside her, and even though the woman they had entered was the same man who'd just ejaculated them, the sperm inside didn't know or care. Nor did Eileen's body care, accommodating the seed willingly and without hesitation.
His sperm swam eagerly through her body, desperate for a second change to fertilize an egg having missed out the first time. Sure enough, they found an egg resting deep inside Eileen, and set about wearing away at its outer walls, the different reproductive cells instinctively cooperating in spite of both coming from the same person. One sperm soon burst inside and merged with the egg, guiding it to move into Eileen's womb and impregnating her.
Ty sensed it through her wish, but in the moment was way too preoccupied with the beautiful MILF above her kissing and rubbing her perfect body against Ty's petite one. She wondered whether to tell her...