My hotwife has asked me to suck her lover

My wife has always been a hotwife. I have enjoyed sharing her in mfm, ffm and mfmf fun but in addition she has a couple of other lovers she meets alone. I have also got a FWB. We are happy with this situation and have been married over 10 years. Recently she has brought her two lovers to our home (not at same time), not when i have been here. She has now asked if i would join them, not to fuck but just to watch and to suck her lovers hard. This is a change and would be the first time i'd not be participating. If feels it is moving from a hotwife situation to a cuck situation. I am 100% straight ,never touched another guy's cock in my life.
If you've been involved sexually with other guys my thoughts are you're bi.
 
after they rested a while i was asked to suck him hard again. And this time as soon as i felt him get aroused in my mouth I became rock solid again. i admit that this time I was stroking my own cock as i sucked him. My wife advised and I did what she advised, i was licking his shaft and wrapping my tongue around his cock, especially the tip of his cock and i also pumped his shaft with my hand, the other hand i was still stroking myself. This time when he was fully hard my wife said to keep sucking him as she was enjoying watching. so this time i sucked him a lot lot longer
Good boi, you must have liked it if you were stroking your cock