Redditors of Reddit, AITA for sleeping with my mom’s (45F) husband (43M)?

So one day, I was looking at my mom’s (45F) husband (43M) when I (21M) started feeling a weird sort of attraction to him (43M). So, of course, being a Redditor, I (21M) went on r/AskReddit and asked if this was normal. Turns out, many Redditors on Reddit have felt the same!

So after this, I (21M) slowly approached my mom’s (45F) husband (43M) and we began kissing. I (21M) rubbed his back, and he (43M) said it felt good. Redditors of Reddit, AITA?????

edit: thanks for the gold kind stranger! it is my only form of income at the moment!!!