3sum withh my husband & another guy🤔😬

Hey beautiful ladies! It’s been a long time since I posted I just had my 2nd baby 4 months ago(my first is 7 now) & I’ve been feeling very down about myself my husband has been wanting me to have a 3sum for awhile with another guy it’s a big fantasy for him I really want to make all his fantasies come true but I’m just not 100% sure it’s something I am comfortable with I shut it down completely the first time bc I was pregnant when he brought it up but this time I was a little more open to it then I was but with my body the way it looks I am just so insecure about myself. I can definitely tell my feelings have changed for my husband I love him but I’m not in love with him anymore. He doesn’t mind if I post pictures and stuff he loves to show me off to other guys and everything and I like posting them to get attention honestly makes me feel good about myself but anyways the guy I would even consider having a 3sum is a friend we’re pretty close too, he’s single & he’s not bad looking either BUT I have had feelings for him in the past & I don’t wanna tell my husband that bc it might hurt his feelings. How would I tell him? He’s 100% down with having the 3sum with him but he doesn’t know that I use to have feelings for him & neither does the other guy…The reason I wouldn’t mind if it was him we did it with us bc he’s our friend, and he’s been with other girls that are bigger & that have stretch marks so I don’t feel like he would care that my body does too I am 132 pounds & I just hate I am so insecure about my body and I just really don’t know what to do…I need advice! Should I tell my husband even tho it will hurt him?? Should I tell the other guy too?? He knows about the 3sum btw. Here’s a pic of my body at 4months PP..