Sofia is staring right at her.

Cassie twisted around to look at the buff athlete, biting her lip seductively, internally channeling as much I'm yours if you take me energy as she could. But where she expected the tall, six-packed clean cut guy to be there was shy Sofia instead.

Her eyes were glued to Cassie's ass.

What? Is Sofia checking me out?

She noticed Cassie looking at her, and her eyes bulged in ill-disguised panic. Sofia quickly pretended she was in the middle of exercises at the pulldown station, and avoided any more eye contact.

Cassie always considered herself firmly straight, but the experience just now had set questions and ideas racing around her head. As she finished her routine she arrived at a conclusion.

It doesn't really matter who is looking right? Let guys and girls both get an eyeful.

She resolved to push a little further, to confirm her guess about Sofia's preferences. The idea of teasing and winding up another girl was starting to unexpectedly appeal to her.

She went to the unoccupied squat rack and started to load up weights. She went through a few warmups, squatting deep and sticking her ass far out at the bottom - good form and showing off her body went hand-and-hand in this case.

After the warmup she started to load up more weight, then decided she'd get a little help.

"Sofia, can you spot me?"

The other girl was just moving between workout stations, pretending she wasn't sneaking any peeks she could at Cassie's sweet apple bottom.

"I, uh, don't know how", she replied with the startled expression of a cornered prey animal.

"I'll show you. Just stand right behind me, with your arms ready to catch and support the bar. Here, I'll do it for you first."

Cassie steered Sofia by the waist to a rack with an empty bar. The skinnier girl took her place under the bar while Cassie positioned herself right behind her, hands ready to catch and support the bar any moment. Their bodies were so close it was easy to just barely brush. She noted Sofia tensed whenever she engineered these little brief contacts.

"You have the hang of it now?"

"I think so..." Sofia said, not even meeting her eyes. From just a few light squats she was flushed and trembling. But she still assumed her position right behind Cassie.

"I'm relying on you," Cassie said, and began.

The other girl followed her movements as closely as she could. Cassie heard her breath hitch whenever they brushed each other. She finished, heaving the weight off her shoulders and onto the rack, then abruptly turned to wrap her arm around Sofia.

"Phew, that was tough. Just hold me up a minute," she said, and Sofia didn't protest or say anything at all. Cassie turned the embrace into a hug. They were almost the same height, Sofia just an inch taller. She felt the girl's body - not just skinny but fit, like a dancer's, through her modest gym clothes. Arching into her, pushing her much larger breasts into the other girl's chest, opening her lips in a calculated look of dreamy seduction, she looked into Sofia's eyes.

"Thank you so much."

Sofia stayed paralyzed for a moment before suddenly breaking contact, blushing furiously.

"I've got to go shower,"

"Me too," Cassie said.

With bug-eyed startlement Sofia pivoted and headed to the locker room. Cassie followed.