Awakening an innocent wife

I'd been married three yrs to a pretty dark haired girl of 22,I was 26, she was only five foot one with a lovely curvy body. Her tits were 34 d when we married but went up to 36d after our daughter was born and never gone down. She was very shy and prudish when we met having been brought up with the help of nuns after the death of her mother when she was 10.
" What do your mean, she won't cum?" Said Roger, my older mate
"She pushes me off when she's close,it's driving me nuts"
" can I be honest Phil?" I nodded
" well, I know she's shy , but have you thought she might be sub?"
It's crossed my mind, but I don't know how to find out, I'm good with established subs , but not a beginner"
"Do you want my advice? The next time she tries stopping you, grab her nipples hurt them and tell her to lie still, then fuck her hard see if she comes then, if she does , you've cracked it. You can really start her on the road,she'll love it" haha
We were meetin for a drink in the local pub later, so josie and I had a bath together before getting ready, I was soaping her body paying special attention to her big tits , her dark brown nipples were like rocks , I was as hard as iron. We got out and dried each other and went to the bedroom, I was rougher than usual and pushed down on the bed, opened her legs and started licking ,reaching up and lightly pinched her nipples, her cunt was soaking
I climbed up between her soft thighs, lined my thick cock up with her cunt and pushed it all in in one push and started hard fucking her.i rolled over getting her on top , she slid up and down my dick and soon was on the brink
She tried getting off but I was ready, I pulled her down and slapped her fleshy arse 8/9 times, now start riding again I ordered
She did and soon got to the point of orgasm again, I gripped her nipples roughly, and she came, and how. Her eyes were rolling , her tits bouncing and she started squirting! I was drenched, her awakening had started