Leyna felt Jeff shift slightly and murmur something in his sleep just before she felt the hardness against her outer thigh.
Leyna just smiled to herself to think that this would have once sent her into a fit over the sinful potential and moral hazards in this situation. She still held firm to her beliefs that intercourse was best saved for marriage and expected her children to follow suit. Their unique situation had tested this belief a lot and in the end it had sharpened her resolve even as it had taught them all that sexuality was simply a fact of life they all had to embrace.
If anything, it had been extremely useful to give them (often literally) hands on sex ed lessons when they were one of the more relevant body parts. Taking the mystique and taboo out of it a bit tempered their attitudes towards it in a very real way and Leyna was pleased to know that her children were all still virgins, even if the definition was strained in some ways.
The definition of incest too had to be reevaluated. Leyna was against it in principle before but now more in theory. No resolve could really withstand Zoe as the hard, needy cock between her legs for long, likewise for when Jeff had been her pussy.
How did this translate to “real life” for them now? Sexual pleasure was just another fact of life, not something to be shamed but not something to be taken too far either. Sometimes your sibling would be spending a few days as a fat penis between your mom’s legs or as her perky breasts. Other days you might be her pussy, her belly fat, or even her anus.