Maybe he's planning on "your turn" tonight?
I don't know if it's this way for other couples (married or been together forever), but DH & I often do what you described, as well as our "regular routine" in the bedroom. By "regular routine," I mean we both get our turn. Sometimes it's thrilling to just concentrate on the pleasure of your partner at an unexpected time and different surrounding. It also breaks up that routine I spoke of previously.
But it's never all about me or all about him for any kind of long-term. Tonight it might be all about me. Tomorrow might be all about us together, each having our turn. Three days from now, it might be all about him. Variety is nice
Since it was a weeknight, a Monday no less, the kids are tucked away and you guys were not sealed away in the privacy of your bedroom -- you were on the couch in, I'm assuming, a living room or family room -- he may have just thought you were giving him a quickie to break up your routine a bit ... or he may have truly thought you were giving him a selfless gift.
Since this hasn't happened before, I'd seductively request your turn tonight. Have some fun with it. Email or text him some "instructions" today pertaining to your request, bring up last night and how turned on it made you feel, and know that tonight is all about you!