Secret Cum Guzzler

So about 2 weeks ago I discovered I can make my hubby cum in his sleep without waking him up and I love it. Its my little thing I do nearly every night that's just for me and his cum somehow tastes better although I think that's more psychological. He starts of with loads of pre cum which I like the taste of then he just absolutely erupts loads of cum which most times I just swallow but do sometimes spit into something. He seems happier as well since I started doing this and I know it sounds bad but I kinda hope he doesn't realise because I just enjoy doing this on my own.