Get the Twins alone
From Create Your Own Story
Harry waited until after the meal, at which point Mrs Weasley asked for everyone to help clean up. Most of them complied, whether reluctantly or willingly, but Harry noticed the twins sneak off before their mother could call on them. He saw this as the perfect opportunity.
Walking up the stairs and following quietly behind the twins, he watched as they slipped into their room. "Wonder what they're up to," thought the Boy-Who-Lived, his lips curling into a suggestive grin. An image of Fred and George making out with each other popped into his mind, entirely naked and penises fully erect. This was enough to get him hard as well. He imagined them rubbig the tips of their cocks together and moaning into each other's mouths as they kissed. Then he pictured Fred slipping a finger into George's tight asshole, his other hand trailing down his twin's chest and stomach before firmly grabbing his dick and pumping it.
This proved too much for Harry to handle. He got up from the wall he was leaning on — he hadn't even noticed at what point in the fantasy it was that he felt faint — and rushed into the Weasley twins' bedroom. The two red-haired boys looked towards the surprise intruder, brows furrowed in confusion.
Harry looked around. Neither of them were naked — not even partially. They were at opposite corners of the room, with Fred rummaging through a drawer and George lounging on his bed. The dark-haired wizard couldn't hold in his disappointment, and he let out an audible sigh.
"What's the matter, Harry?" George piped, sitting up.
"Mom didn't ask you to call us down, did she?" Fred added, face twisted in a bit of a cringe. He looked Harry up and down in inspection, but slowed and stopped when he came upon the sight of the younger boy's significant bulge. "Or maybe you're here for an entirely different reason." Fred's tone had hanged completely, his voice now low and seductive. He lifted an eyerow and ran his tongue over his bottom lip.
"And if I did?" Harry asked, his erection growing at Fred's lewd smirk.
All at once, both twins stood in front of him, their arms draped around each other as they pretended to scrutinize him. There was a long pause of silence as Harry waited for them to say something. With their free hands, they lifted his arm and tipped his head, poked his thigh and patted his leg. They seemed to be inspecting every inch of him.
"Sorry, Harry," George said finally. "We only do girls."
"But," Fred stated, a mischievous grin spreading across his face, "If you're willing—"
"—We could work something out," George finished for his brother, and from the glint in their eyes Harry knew exactly what it was that they wanted to do.
