My bro wife 26 years [F]

I always had a crush on my brother wife..in sexual way..though she not that attractive but i find her so sexy …every time i see her or even think about het i had a boner.. The problem i was so afraid to seduce her especially..she seems very Loyal (well mannered)..so i did a nasty thing i installed a spyware in her phone to spy in her (u know grabing sexy photos..videos..) …untill one day ?..i got shocked..i caught her cheating with another man talking in dirty way very bad way..sexting..nasty photo and video..booyah i had a chance ? to blackmail her..i meet her one day and we had a chat and i told her that i know every thing about her little dirty secret..she start craying and begs me to not tell..she was ready to do any thing i want.i gived her a nice French kiss and touched her breasts but i couldnt continue ?.. She enjoyed that..i regret now that i didnt fuck her..what do u think guys ?❓
Should i fuck the shit of her?