Slumber party

"I have an idea, my mates", you say. The tigress and panther look at you with hunger. "What is it baby?" your girlfriend asked. You point up to a house with music comming out of it. It was the slumber party you saw earlier, still filled with girls just waiting to be mated with. Your mates grin as they caught the idea and got on all fours. We all make a run to one of the windows to look inside, and what a site it was. Already you've spotted two girls making out, surrounded by other girls giggling. You look behind you to see your girlfriend and the new panther girl gaze in admiration at the lustful sight. "Let's crash this little party, shall we?", you say in a husky voice. You already get hard as you slide the window open and the three of you slip in. A girl in the front of the group notices you first. Your tigress beauty jumps to block the only exit, growling in defense and lust. The girl you face starts to scream before you pin her down and tear her clothes off. You then take your tiger cock out and ram it into her, making her and the other four girls scream. You feel energized as you **** this fine girl, and go faster as you see she begins to enjoy it. You think and wonder if the transformation is happening quicker now than before, but don't care afterwards. You finally climax, along with the girl, her finally cumming and transforming, with brown fur growing, breasts enlarging, ass more supple, body more slender, and ears more pointed. She seems to become a minx of some sort, growling in ecstacy. You look off to the side and see the other four have already been taken care of by your other two pack mates. "What are we, and why does it feel so good?" , the minx girl asked. "You are our pack mate now", you say.