Paying The Babysitter

We have a boy sitter who comes to our house when we go to a party. Most times he stays over sleeping, as our parties end late.
The next morning he joins for breakfast, we pay him and he goes back home.
Things started when he was 14, now he is 16. Over those years he comes by once or twice a month.
He always stared at me, which I thought was fun, harmless. I could be kinda flirty with him, tease him a bit.

About 3 months back we had a busy week, when I wanted to pay him, we had no cash. I asked if it was OK to pay him otherwise. Whilst I meant by bank, he blushed and whispered really, staring at my cleavage.
I took him away, asking if that's what he wanted to see. He said yes, and I had fun showing him my boobs, letting him touch.
Hubby thought is was kinda hot, I could do more for him. The next time came, hubby booked me up and when we got home, sitter was in our living room, hubby just whispered he might want some oral relief. I blushed, went to him and asked how he liked last time. He smiled, really hot, I asked if he jerked off and he said he did at home. Want some help, I asked, and took my tits out, helped him jerk and sucked the last part.
Since then, every time we come home, hubby goes straight up to our bedroom, I pay the sitter by sucking him off, swallowing his load then go to hubby and get fucked.
Next morning we all don't mention the subject. ( no intentions of fucking him either)