Becoming The Younger Man In A Couple

My neighbour Dennis is a fifty three year old married man whose wife is wheelchair bound through cancer.
He's her carer and really really looks after his wife. But Dennis needs stress release from his constant caring and that's where I come in.
Two or three weekday mornings each week I'll wake up, use the loo, take a shower and shave my face, balls and under arms. Then I'll deuce making myself internally clean and get myself lubed up.

Usually within fifteen minutes of me getting out of the shower I'll unlock my front door and place myself on my sofa, bed or kitchen island stool depending where Dennis has messaged me to be.
When Dennis enters my home he likes to look at my slim naked body, play with his cock and almost always finger fuck my rear hole before he plunges his six inch super thick cock up my arse.
He doesn't like me sucking his dick because he cums too quickly, so he fucks me like a rag doll instead.
It's always an intense orgasm getting fuck for me, and I never fail to cum as his cock pumps against my prostate gland.

As for Dennis when he's fucking me he's a stayer. It's weird if, and I have done several times, suck his cock, he cums within a minute. However when he fucks me he can last up to ten to fifteen minutes sometimes.
And boy is he a big cummer.
If we've not fucked on the Friday and I don't see him until the Tuesday because of his demands at home, then when he fucks and cums in me, it's like a torrent of semen flooding my bowels as his cum pumps away.

We've become extremely good friends despite the age gap, and recently he's been staying after the sex ( He used to fuck me, cum and go) He doesn't stay long, just long enough for a coffee. But he now likes to kiss and hold me which I love.
By eight am I'm ready for working at home after a brief shower where Dennis's cum oozes out of my arsehole.

Yesterday morning after fucking me on my bed. I made us coffee and Dennis kissed and cuddled with me. He also told me when his wife sadly goes, he'd like me and him to become more of a 'couple' type thing.
I was about to mention his daughters, but he let me know he'd already told them about us and they're fine with it. In fact later today I'm going to meet the eldest one. She's apparently known for some time her father has been 'seeing' me.
I'm a bit apprehensive, but I'm sure things will be fine.