This doujin has gone without English translation (afaik) for quite a while, so I tried my hand at it.
It’s an amateur translation and there is likely to be issues, but I’m hoping it may be of some value to upload. If not, hopefully someday it receives a proper translation that does it justice.
I admit that I am a little disappointed now that I can finally read the plot. I assumed it was a case where they were already a couple (or at least mutually romantically inclined) but she was hiding her status as a futa due to not being sure he would accept. Instead it is just her losing to her lust upon seeing a bit of fresh meat and not really caring about the former dude beyond how good of a hole they've got. Even the character page at the end confirmed she was never interested before.