Boyfriends fetishes...

Andrea
So, my boyfriend... Which is the father of my child, this year is two years of us being together. 
Every time I suck his dick, and he's extremely into it... He tells me, "I want to watch you suck someone else's dick." "You're just so good, I can't keep you to myself. It wouldn't be fair.." 
But just the thought of me doing it, makes him SO much more turned on... 
And it's not like he's asking to fuck someone else, or have a 3-some... He just really wants to watch me suck off another guy. 
Anyone else's SO ever say something like this? 
What would you do? Lol 
Like, if it's so good, KEEP IT TO YOURSELF, LOCK IT UP, AND NEVER LET IT GO. Lmao