Seems like Yara and Eva are here

Peeking into the locker room, I saw my two female friends, Yara and Eva, engaged in a close conversation, seated on the middle bench, their backs turned to the entrance where I was looking at them.

"It's just super annoying when they do that... Like don't they get the hint?"
"You can't imagine how many times I have to reiterate that I'm not interested. These dumbos simply do not understand."

Obviously, the topic was boys.
"And honestly, I'm pretty sure that I'm ace."

That was a revelation. I mean I kind of imagined it from her but I didn't expect her to actually find the words for it, let alone say these words...
"You're not." Yara was confident in what she was saying.
Eva looked at her, questioning her statement.

"You're not. You're obviously into girls." She explained. "I see how you look at them longingly when you think they're not looking, how your eyes try to catch a glimpse at every moment their asses are on display. You're not as sly as you think you are in our gymnastics classes, you know. Especially here in the locker rooms."

Eva was stunned, she tried to argue against it.
"You're mistaken. It's normal to look at girls, everyone does it!"
"Then it would do nothing to you if I kissed you right now."
"W.. What?"
"We're alone, your date all but left you behind, whether that was $name or whoever else...Best time to find out if you're a lesbian or not is now." She explained, slightly moving closer to her nerdy friend.

I watched in rapt attention, trying to see what Eva would do.
She was thoughtful for a while, before she looked at the athletic Yara and nodded her head.

She was willing to try.
And Yara was eager to take the opportunity to make her move on the nerd, pursing her lips and placing them against the soft ones that were awaiting them.

And they kissed, unaware of their friend that was watching them from the door, their lips grazing softly against one another. Yara was smart in her approach, her wet lips giving their soft kiss then retreating, as she looked at her friend.

Silence. Tension. Yara moved back in for another kiss, this time allowing it to last a little longer than last time as their lips intertwined and her mouth pressed a bit stronger against her friend's. Even if the person was totally straight, the technique that she exhibited would give them doubts about their sexuality...

And doubt appeared on Eva's face when they separated another time. This time, she was the one to move in for another kiss.

And I watched my two friends in their secluded place share these lovely kisses and explore each other's mouths, as their beautiful spark progressively grew into a stronger flame.
Yara moved to straddle the nerdy friend, their kisses never stopping as she pressed her body against hers, her hands holding her face to kiss her better.

She was confident, domineering, and I was loving what I was seeing as their kisses grew stronger and more passionate.
Their lips separated. They looked at each other.
Eva was trying to catch her breath.
I watched in rapt attention.
Yara looked at me, seeing me perving on the naughty couple.
I was startled, and didn't know what to do.

She smiled and winked at me, before moving back in for another kiss.