Finding out my ex gf’s daughter watched me bang her mum on the baby monitor

My ex and I had split up but lived close to each other,we both got new partners and we ended up cheating on them with each other. I got a Txt from her one night telling me to come to her Place late that night she needed to talk to me.
she said she will txt me when to come and the door would be unlocked. Phone pinged
Off I went, door unlocked her kids were asleep 20f 17m.
Crept in to her room where she was waiting I sat on the bed, she didn’t want to talk she wanted to be fucked
She initiated things I obliged her
We had crazy hard sex for almost 2 hrs
After recovering I went home exhausted, I got a txt from her daughter who said she watched us on baby monitor that was accidentally left in mums room after baby sitting duties
Embarrassed stumbling for words to reply, I managed to send I’m so sorry i don’t know what to say and does your mum know, reply comes back “no way I’d tell mum and dont say sorry and that she totally loved watching and listening”
I then get a video msg from her fingering her pussy and putting her fingers in her mouth telling me how horny it made her
We have had 3 encounters since then
Haven’t fucked her she won’t let me she likes the thrill of me wanting to fuck her, she always wants me to jack off and cum on my stomach with her head on my stomach then rubs the cum onto her tits n chest..