My boyfriend is really weird

So my boyfriend works for a couple he does light maitence and yard stuff. Long story short I babysat for this lady. She told me that my bf needed to come to help me with her dog so I got there and noticed her two daughters are crushing on my man. Which doesn't bother him by the way. I caught the youngest touching his penis nonchalantly and the other one would get on his shoulders and it looked like she was grinding her lil hoo hoo on him. I'm positive he had a erection. And what's scary is that I was turned on immediately. I'm almost positive that he want me to do it again.