I let my dad's best friend know I'm an adult now

I'm 18F, home from college for the holidays. Dad's been a drunk for as long as I can remember  bad binges, lost jobs, the whole mess. About a year and a half ago he hit rock bottom and started getting help. His best friend (let's call him Tom, mid-40s, single, handsome in that rugged dad way  tall, salt-and-pepper hair, strong arms from manual work) stepped up big time. Tom's been there consistently: Sunday mornings for coffee and talks, Wednesdays after work for AA meetings, random days when Dad's struggling. He's basically saved Dad's life.

Tuesday morning Dad headed out for groceries
early. I was still in bed in my nightie  thin tank and shorts, no bra, hair messy.
Knock on the door woke me up. I padded over, peeked through the peephole  Tom. Opened the door, smiled sleepy. “Hey,
come in. Dad's out but he'll be back soon.”

He stepped inside, looked me up and down  not creepy, but lingering. I felt it. Gave him
a huge hug  tight, genuine  thanked him for everything he's done for Dad.
“You’re like family. We owe you so much.”

He hugged back  arms strong around me, hand low on my back.
Pulled away slow. “No thanks needed. I'm just glad he's doing better.”

I brought him to the kitchen, poured him water.
We talked  leaning against the counter,
close. He asked about college, I asked about his work. The air got thicker. His
eyes kept dropping to my nipples through the thin tank, then back up. I didn't
adjust it. Instead I leaned forward a little, let him see more. He swallowed
hard.

Something sparked. He set the glass down,
stepped closer. “You’ve grown up,” he said quietly.

I looked up at him. “You noticed?”

He didn't answer. Just kissed me  deep, slow, hand on my waist pulling me
against him. I kissed back  hungry,
wrapping my arms around his neck. His other hand slid under my tank, cupped my
breast, thumbed my nipple hard. I moaned into his mouth.

Clothes came off fast. My tank hit the floor.
His shirt. My shorts. He lifted me onto the counter  cold granite on my ass. Spread my legs wide.
Dropped to his knees. Tongue on my pussy  flat licks, then sucking my clit. Fingers
inside me  two, curling, pumping. I came
quick  shaking, moaning loud, soaking his
chin.

He stood, unzipped. Pulled out his cock  thick, veiny, hard. I stroked him while he
kissed my neck. Then he lined up, pushed in slow. The stretch was perfect  filling me deep. He started thrusting  steady, hips snapping, hands gripping my
thighs. I wrapped my legs around him, pulled him deeper. Moaned his name.

That's when I heard the front door click.

Dad. Back from groceries. Bags in hand. He
froze in the kitchen doorway  eyes wide,
watching his best friend fuck me on the counter.

Tom didn't notice  too lost in pounding me. Dad didn't move.
Didn't say a word. Just stood there, bags still in his hands, watching his
friend's cock slide in and out of me. I locked eyes with Dad. Panic. Shock. But
also… heat. Something twisted and hot. I didn't stop. Moaned louder. “Harder…
fuck me harder…”

Tom did  slamming deep, grunting. Dad's face flushed.
He set the bags down quietly, didn't leave. Watched the whole time.

Tom tensed. “Gonna cum…” He pulled out, stroked
fast over my stomach. Came hard  thick
ropes across my skin. Warm, heavy. He collapsed against me, breathing ragged.

Dad slipped away silent  back to the garage or something. Tom didn't
see him.

We cleaned up. Tom kissed me soft. “That was…
wow.” I smiled, still shaking. “Yeah. Wow.”