Gotta strip before you study, duh.

Scoffing, you look at her body, "Well, we can't study anything under all that. Constrictive clothing like that just slows blood flow to the brain." That's bullshit. "Really? I never knew that…" You're amazed but roll with it, nodding, "Y-yeah, start with your top, and then your uh, skirt, l-leave your socks and glasses on though…" you excitedly spectate. She agrees and peels her top off, her huge tits toppling out, sliding her skirt and panties down, revealing her healthy hips around her shaved crotch. "Hm, I just feel colder… And a little uh, uncomfortable…" She does look pretty uncomfortable, shuffling around and blushing, she looks like she may start crying. Ever ignorant you hug her nice and tight, squeezing her breasts, licking and sucking, kissing and gnawing, they're soft as silk and taste like sweet sinful skin. She gasps aloud, "O-oh is this part of the, nnn… Studying?" You pant for air, hastily pushing your skirt down, letting your cock stick out. You can hear her breath shake, her frail fingers holding your head and back, pulling you close. Feeling Sierra's embrace and losing your thoughts, latched onto her chest and feeling her tender skin, you can't help but keep thinking about if you were dating her. Dumb idea again, you probably have nothing in common. "Get on your knees…" you breath out, catching your breath. "My knees? W-why…" "Just do it…" She slowly lowers to her knees, shakily breathing from her mouth, eyeballing your twitching dick. Groping and fondling her chest, you slip your dick snug between her tits and start pumping up and down, Sierra's face going red. "Aaaah… I feel really hot Gwyn… My heart is pounding…" You keel over her, planting your hand on the wall, continuing to fuck her chest, Sierra squeezing tight around your dick. Your cock's head prods her lips some, eventually suggesting her to open up. Her lips part, a wet, hot tongue greeting your dick, gently sucking. Whining a drooling, you thrust some pace faster, before gritting your teeth and spurting stream after stream inside her innocent mouth. She meekly pushes you off, plopping her nude self on the ground, looking up at you shamefully, a mouth full of cum, as if awaiting directions. "Uh, n-now you swallow…" Her face becomes distraught as she repulses, as if about to spit up the cum, before closing her eyes and swallowing, letting out a "bleh…" and sliding her clothes back on. She holds you, gentle and heavy, before letting go and walking off. That was a fine, fine use of school time.