Fucking My Husband's Best Friend While He Is in the Shower

So I've been fucking my husband's lifelong best friend for almost two years now. We've fucked in bed while he was out next to us, on our wedding anniversary, and really just all over the place all of the time. My husband is truly clueless, and his best friend could care less (either could I). It's way too great of sex, and too much fun, to do it right under his nose. Last night we had a big party for my husband's birthday, and of course, we snuck into the guest room and fucked while he was right outside having a great time. Being his best friend, he stayed the night, so we could continue the birthday festivities the next day with some brunch. I take a shower to start getting ready, and as soon as my husband gets in the shower I text his friend to come and fuck me. Turns out my husband left his towel too, so we used it as a fuck and cleanup towel. We lost track of time, and soon, the shower turns off and he has to hurry up and cum or get caught.