The closest I have ever been sucking a dick was when I licked my wife pussy while she was riding her lover and his dick fell out of her and slapped me on my chin. Sucking a dick is not a turn on for me, i'm not bi and I don't really know how my wife's lover would react to it..., even thou I grabbed his cock with two fingers and put his cock back inside my wife's pussy....
Of cause I kiss my wife after she have sucked me, or her lovers cock.. She has nothing against kissing me, or her lover, when our mouths is wet from her pussy, I have even kissed her just minutes after she had sucked off her lover and swallowed his cum. I did not want too, but she sort of forced me to do it and I liked it so much that she still do that from time to time, coz it turns her on...
And yeah, kissing my wife while another man slowly fuck's her is really hot, it is soo good too feel the other mans movement thru my wife and hear her moan in deep pleasure and enjoyment with his cock inside her.. Really loves that..