Based on my own experience, I’m not sure the OP ever has to discuss the “gay lifestyle” with his mom again - he’s there, he can make the best judgment. But I would not automatically assume that the fact it has been raised once by his mom truly means that she needs or wants to talk about it further.
My own experience is with the issue of virginity. Not such a big deal, you say, but when I was a girl coming of age in the 1970s with a traditional father, I assure you that my virginity was a HUGE deal for him. I had sex for the first time at age 16 and continued to enjoy myself thereafter, but I sure as hell pretended to my dad that I was completely pure.
So. One summer when I was 19 or 20 years old and living in Boston’s South End, my dad came for a visit and took me to lunch. As he was dropping me off back at the house where I was living, he said, in a grave, slightly strangled voice …“CairoCarol?”
I paused, knowing something was up.
“You, ah, you aren’t … ‘living’ with Brian, are you?” (Brian, of course, was my boyfriend at the time.)
I had to think fast. I was absolutely shocked that he’d raise the matter, because I figured that (a) I had him completely fooled; and (b) he had enough sense to realize that what he didn’t know wouldn’t hurt him.
Clearly, complete denial was in order, but I absolutely loathe lying. Anyway, I took a deep breath and said, in my best imitation of a hurt tone of voice “Daddy…what on earth would make you ask a question like THAT?”
He interpreted this to mean I was indeed the sweet innocent virgin he wanted me to be, and drove home, apparently mollified. And he never raised the subject again, ever.
I can’t explain what caused him to raise the issue in the first place, since it clearly was not something he wanted to think about. Maybe someone whispered something in his ear just as Mrs. C planted ideas in the mind of fervour’s mom. But in any case, he got over it.
While it is impossible for me to know if a similar dynamic could occur for fervour, I wouldn’t rule it out. As a general matter, I think it is sad and ridiculous that people have to hide who they are – how much better a world it would be if fervour’s mom had not been poisoned with an anti-gay attitude to begin with. But things are what they are. If fervour would prefer that the issue just go away, he ought to give it some time, and see if maybe it will.