Joey had really enjoyed being a mare for Lorena, but sie still felt horney. Watching Sara's butt wiggle and tail swish as sie headed up the porch stairs, Joey's nostrils flared and hir ears twitched forward. "Hey Sara...I just realized I could use some help getting dressed," sie said.
Sara looked back over hir shoulder with a naughty grin. "What's the matter, not sure how to get a bra on?"
Joey snorted. "You tricked me into being this, the least you can do is help me deal with."
Sara gave a nickering laugh. "Come on, then, Ms. Stallion/Mare/Person/Thing."
Soon the two were in Sara's room surrounded by piles of clothes. Joey was intrigued by how things had adjusted for hir wishes. Sara's clothes had all been resized to fit hir new shape. Skirts and pants had holes for hir tail, and pants had a lot of room in the crotch that sie had not needed before. Sie did not have normal shoes anymore, of course, but sie did have a variety of horseshoes for different scenarios. Sie still had makeup but in darker colors to go with the dark flesh of hir muzzle. Hir jewlery box was still overflowing, but now included large rings to go on hir tail and earrings designed to complement hir tall ears.
Sara was dressed only in a slip, and was attempting to fit Joey into a little black party dress, but as it turned out it was too little. "I had no idea you'd end up bustier than me!" huffed Sara as sie tried to tuck Joey's cleavage into the dress. "I think I'm jealous."
Joey would have blushed if sie were still human. Instead sie nuzzled against Sara's shoulder and then giggled. "Guess it's a good thing I didn't go for cow morphs, huh?"
Sara rolled hir eyes. "Oh I don't know..." Sie cupped one of Joey's large breasts. "Maybe you did!"
Joey neighed in mock anger and stuck hir tongue out at Sara. "Keep it up and I'll let you see what it's like to have udders instead of these..." sie cupped Sara's breasts and teased the nipples through the slip.
Sara gasped and raised an eyebrow. "Joey...what are you thinking?" sie wondered. Sie made no move to back away.
Joey nuzzled hir again, this time nipping gently at Sara's long, beautiful equine neck. "Just that you've always been my favorite cousin...and now I feel even closer to you..." said Joy, pausing from time to time to nibble.
Sara mmmmmmed. Sie realized with some surprise that hir hand was still on Joey's breast and gently began to rub it, feeling its pleasant soft weight. "Is that all?" sie wondered.
Joey smiled and kissed hir lightly. "That...and that horses don't have so many picky rules about herdmates..."
Sara returned the kiss and laughed. "I think you're thinking with your stallion parts instead of your mare parts." So saying, she stroked Joey's sheath through the skirt of the dress. The hefty bulge began to rapidly grow as Joey's equine cock dropped from its sheath.
Joey groaned and pulled Sara into a hug and kissed hir more thoroughly. Sie reveled in the feeling of hir cock as it hardened under the skirt. It felt enormous as it pressed between their bodies. Disconertingly, Joey felt an answering pressure from Sara as sie answered hir kisses passionately. Soon their cocks forced their way out from under hemlines, the massive equine shafts rubbing against each other.
Sara shuddered at the still-unfamiliar feeling of hir erection. At the same time hir mare's sex was sopping wet and ached to be filled. "Going to show me how to use one of these?" sie wondered as sie stroked Joey's cock.
Joey nodded wordlessly and pressed gently on Sara's shoulders. Sara obeyed, feeling an odd submissiveness. For now, sie was the mare and Joey hir stallion. Sie knelt before him, facing away, hir tail flipping up and out of the way as sie made hirself ready to be mounted by hir stud.
Joey felt wonderful, powerful. Hir cock was as hard as steel and yet more sensitive than he could believe. Sie knelt behind Sara and grasped hir shaft with both hands, rubbing the thick rounded head against Sara'a dripping sex. With a sudden thrust, sie buried hir stallionhood deep in hir cousin's pussy. Sara neighed happily, ears flicking and tail swishing softly against Joey as sie pushed more and more of hir cock into Sara.
Joey moved hir hands to Sara's hips and began to thrust. Sie knew now what Lorena had felt earlier. Sie was a stallion, mounting his mare. Joey's thrusts were deep and powerful, making Sara squeal happily. It was not long before both came in a shattering orgasm that left them panting in bliss.
Joey bent over Sara, cupping Sara's breasts as they dangled beneath. "Ready for the party?" sie giggled in Sara's ear.