Update #8
Plans fell rather easily again, although I'll be going to out-of-country for vacation next week - it was a last minute change, but my friend will keep me posted.
That said, I'll be dropping by to spend the night - I did call them to tell them, and I want to say my mother sounded a bit on edge by the news.
From what my friend told me, the sexual high is starting to settle down, but they're still going at it relatively often. Thus far, he's had her in her marital bed, against the bedroom door, the bathtub and shower, and managed to press her against the bedroom window - they had a brief session in the kitchen, but that quickly transferred to the bedroom.
Per the request of a close advisor here, he's going to be trying to warm her up to anal a bit more, but he said he'll have to take it slow on that end of the spectrum.
Besides that, he almost got to convincing her to pick up one of my calls, but she came a minute too soon, before I was free to call them. That said, I did proceed to call, and did hear her gasping out of breath - she chalked it to having finished a heavy workout, which I suppose is true - but I can say that was the hottest thing to happen thus far.
I do know that my stepfather called her last night, but she didn't answer immediately - for obvious reasons - she ended up telling him that she had fallen asleep early, and was unable to pick up. Apparently she was feeling incredibly guilty by that, but it wore off gradually once he began to comfort her, and they ended up at it again.