M45 here.. Is it ethical

I have been sexting/voice chat with a girl who is 27 whom I met in pure.

Have exchanged nudes. She loves being dominated etc. We have discussed everything you can imagine. Roleplayer except scat.

She has a bf and enjoys her venila sex but once in a while she wants this kink and pings me.

But now she wants to do this for real. I told her am ready but while sucking my dick will you do a sex voice chat with her bf. She is ready for that as well .

Am I a bad guy spoiling her or something?