"Sorry to disappoint you" said Jake.
There was a moment of silence as the two lamias lay next to each other on the bed. Then Kelly wrapped her snake tail with Jake's. It was an amazing feeling, deeper than the deepest hug. Jake turned to look at Kelly who kissed him.
"As much as I wanted your penis in me" said Kelly "I'm happy to continue mutual masturbation." She punctuated that by sliding an extra finger into your cloaca, causing you to shudder with pleasure. "Besides, if the legging really did give you a female tail you're really in for a treat."
Jake was still worried, but Kelly was having so much fun with this and it felt so good. Jake kissed Kelly and slid another finger into her as well. The two kissed and fingered, all the while keeping their tails entwined. They lost track of time, reveling in the new sensations. Jake was the first to orgasm.