"You know, it's not great." Jess said, a glint in her eye and a half smile was all that warned Mary.
"Ooomph!" Mary's breath was knocked out of her as a huge water-filled half-pig lunged and pinned her to the floor. Water sloshed inside of Jess, making it feel like a water mattress was attacking her. The weight was enough to keep her from moving, much less getting out from under Jess. Mary smiled into huge piggish breasts.
"However," Jess continued, "it'll be much better with a friend." Jess adjusted herself to both keep Mary pinned down and to be able to reach the vials. She picked two. One was the water balloon Mary had fed her. The other Mary wasn't able to see. "Open wide!" Jess tipped the balloon vial into Mary's mouth followed by the other.
Mary swallowed the two vials and waited for the inevitable changes. She was going to be a balloon and something. "Jess, what did you feed me?"
"You'll see." Jess said with a wink.