Best part... hmmmm that's hard to answer for me. It's amazing, the whole thing. LOVE watching her fuck a guy, so being right there watching as his cock slides in and out is perfect. Licking his cock and her pussy as they fuck is great for an oral fixated guy like myself. Tasting and smelling them as they fuck... and lastly watching his balls tighten and feeling his cock pulse as he fills her... pulls out and I clean up. It's an amazing experience for us. Not for everyone but if you're orally inclined I highly recommend giving it a try, even if you just lick her clit... she'll thank you