Is it normal my girlfriend thinks it's hot when i...

My girlfriend sucks me off into her mom's coffee, I think her mom knows, but, sometimes two times a day into mom's food or drink, my girlfriend gets so turned on by it, she sometimes gives me road head right until the point of blasting, so when mom walks the dog, or leaves to fold the laundry, instant mega-load, it turns me on again knowing my jizz is running down her mom's throat and into her stomach, my girlfriend doesn't know, but her mom gives better head than her, her mom's mouth feels warmer, softer, and moves puffier lips faster up and down! Also I would have broke up with her so long ago, but her mom also swallows, I say "hey, I'm gonna cum... right now!!" Her mom says "ok" then speeds up and sucks my load out of my cock, the absolute best, mom loves my cock, can't get enough, so if my girlfriend says no more blowjobs until you apologize to my sister! I just fuck her until she's ready to fall asleep, and when she's asleep, run to the bathroom where her mom meets me, ready to eat my babies, she sucks me dry, then keeps giving me head usually until pee in her mouth, no joke, she washes me down with piss, last night I came three times, she sucked me off for another half hour, until I couldn't not piss, she sucked the piss out of me, the first time her mom ever saw my dick, she was out of town with her dad, perfect right, her mom spent 4 hours or more, laping at my dick, sucking , twisting, rubbing, throating, almost the full 4-5 hours it was going on sucking, I've never meet someone who loved, worshipped my cock more, I can't break up with her, her mom loves my dick too much! But it sure does make my girls pussy wet when I'm dumping loads in her mom's drinks, I wonder if she knows, do you think she knows? should I tell her? what if they want a three some? What do I do?