Phineas closed the door, then locked it, just so they don't get any interruptions.

Phineas: "So... how do you wanna do this?"

Phineas was twisting his fingers, blushing a little.

Isabella: "Well... I like to start of, with a gentle kiss, which will slowly turn into a french kiss- Wait, do you know what a french kiss is, or even sex?"

Phineas: "Yes, yes I know what sex is. And a french kiss is kissing, with tongues touching each other. Am I wrong?"

Isabella: "No no no, you're right."

She sat down on Phineas's bed.

Isabella: "Anyway. After that, we both take each other's clothes off. Then that's where the hot part comes in. w"

Phineas: "Ok, seems simple enough."

Phineas sat next to Isabella. He then made a gesture, for Isabella to make the first move. Isabella lunged at Phineas. She then softly kissed his lips. (Which was a little different, considering that his head is shaped like a triangle. But she got the hang of it.) When she got used to it, Phineas turned him, and Isabella over. They turned the sweet kiss, into a french kiss.

But unfortunately, as soon as Isabella grab a 2 hand fulls of Phineas's ass. They heard their parents coming back from picking up Candace from the mall.

Isabella (whispering): "Fuck."

Phineas: "Don't worry, we'll continue this later."

Isabella let go of the Phineas ass, and they got off from the bed.

Isabella: "Yeah, I guess you're right."

Phineas unlocked the door, then opened it for Isabella. To which she loved the offer.