My Sleepy Brain... Help?

This is why we call Neville...

Harry smiles thankfully up at his brother. "Thanks Nev, I thought that plant was harmless?" Neville looks back at him, "Typically it is, unless you try and cut it. It's used for a lot of potions, I guess I should have warned you." Harry shrugs rubbing Severus's back as he trembles. "So, how long until that stuff works its way out of his system?" Neville smirks, "about a week... unless you two have sex." Harry stares up at his brother shocked. "Neville, did you just..." Neville cackles. "Harry, I have a girlfriend, I know about sex. Although, I wouldn't recommend having sex with him, it'll cause the effects to last longer." Harry nods. "Thanks Neville, I'll make sure not to." Neville smirks, "He will start begging for it after a few hours, and he won't be satisfied until it's out of his system." Harry nods, "so bed rest?" Neville chuckles, "that would probably help." Harry smiles, standing and hugging his brother. "You are one of the reasons I haven't been killed yet, thank you." Neville hugs him back tightly. "Anytime you're my younger brother in all but blood after all." Harry smiles, before letting Neville leave. Neville leaves and Severus is left alone with Harry. "Bed time." Severus nods before standing up. They walk to his room, getting him tucked into bed. Harry leaves, seeing the Twins curious gaze. "He will be sick for a week, no one is allowed near him." The twins both looked shocked before asking, "Sick? How? Is it contagious?" Harry watches the verbal tennis match before saying, "Not contagious, just annoying. He's got a plant problem, that needs time to get rid of, I don't want his problem set back." The twins nod, seemingly satisfied. "So, do you have time for us?" Fred asks. Harry looks them over, "I'll follow you to your room, you will explain why." The twins nod.