He Wants To Join In, I Think.

My newish neighbours across the street Alice and John are both in their mid forties. John drives buses for a living which means he works different shifts.
And for the past eight months I've been fucking his wife pretty much every single day.
Alice is an average looking woman, however she is by far the dirtiest slut I've had sex with.
She is constantly horny which suits me as I have a very high sex drive, especially when the woman is prepared to do almost anything sexual.
We began fucking the very first time we met outside our local shops. It was clear she was interested in me sexually as we spoke, and like she was asking me about the weather Alice wanted to know if a young guy like me had sexual stamina.
I told her there was only one way to find out and fifteen minutes later in her kitchen i was fucking her from behind as she leaned over their kitchen table.
Since then I've fucked her mouth pussy and arsehole most days.
Yesterday we drove over to bluebell woods where I fucked her as another man watched and wanked nearby and she couldn't have cared less.
Also yesterday, and I genuinely didn't know this, is her husband John knows and accepts his wife is being fucked by me. In fact he's asked Alice if I would let him watch
Now I know some married men are into this, but I'm not into guys sexually at all. So is John just wanting to watch me fuck Alice, or do you think he wants to take part and interact with me.
I don't want to stop fucking his wife, but I'm not sure id want him involved so I can continue fucking her.