Malfoy stared at him, skeptically, as though waiting for the trap.
"There's a fully stocked pantry?" Harry stated.
Malfoy lowered his eyes as his stomach growled. Harry wondered when was the last time Malfoy ate.
"What do you want?" Malfoy asked carefully, keeping his eyes on the floor.
"Want?" Harry replied, confused.
"As... payment."
"I don't have any rent," Harry said.
Malfoy sighed. "What do you want me to do... for this favor?"
It finally dawned on him what Malfoy meant. Harry supposed that Slytherins rarely gave or got anything for free. The way Malfoy kept his eyes downcast made him think Malfoy meant it sexually. Merlin... he prayed that Draco hadn't been abused like that.
"There's no cost, Malfoy. I hope you'd try to be nice to me and my friends... or at least not too nasty? I won't ever demand payment, though. I swear that I never will ask you to do anything or pay anything to live with me."
Draco seemed to debate this. After a moment of fidgeting, he murmured, embarrassed, "I'd be... appreciative... if I could stay in your home."
"Sure, Malfoy... let's get you home and fed," Harry said, gesturing to the door.
An hour later, Malfoy was at his table, showered, in clean robes, and eating soup across from him. Draco had to stop a few times as his stomach was aching from eating food after too long without anything. Harry's heart ached that Malfoy had gone so long without anything. The next day, he had a private healer come and, after she signed a confidentiality contract, she saw Draco, who wasn't happy about his meddling. She prescribed him several Nutrient Potions and Restorative Draughts.
Draco hated taking them. Harry had to argue with him every day to take them, which he did, after a fuss. Harry eventually worked him up to full meals, getting Draco to tell him what he liked and buying expensive desserts, which Draco devoured every night as he jokingly bickered with him. Slowly, he gained his weight and confidence back. Harry went to work during the day, but Draco stayed home... reading, he guessed? He refused to surveil the git... at least when he wasn't there. When he was there... Harry was finding it harder not to 'surveil' him. 
Merlin, Draco was drop-dead gorgeous. The git would occasionally walk around with nothing but pants or worse, a towel around his waist and bloody talk to him like that. Harry had figured out after the war that it wasn't buff girls he liked. He liked guys, and Draco was one of the sexiest men he knew. He was having trouble not staring at him whenever he came down, fresh from the shower, nothing but a towel on, for a coffee and a Danish every morning. He'd tell Potter to fix his hair and have a good day at work, and that he needed to go back upstairs to "fix" his already perfect hair. Was Malfoy messing with him?
After a month of them tip-toeing around each other, Harry was nearly at his breaking point. He couldn't break Draco's trust in him. However, he was frustrated with yet another 'argument' at dinner over the correct holding of a bloody fork, of all things, and Harry went upstairs to shower to work out his sexual frustration in the hot water. He had to keep quiet, as he didn't want to put up privacy wards, so Malfoy could guess what he was doing. However, he was surprised when suddenly Draco pulled open the shower curtain, mid-wank.
"Draco!" he spluttered, angrily, but Harry's mouth dropped when he realized that Draco was naked, too.
Draco, however, came right into the shower and dropped to his knees in the shower spray and just swallowed his dick without a word. Harry was so surprised, and he wasn't about to stop him sucking him off. When he finally came, with a shudder, Draco swallowed it. Harry turned off the water, uncertain of how to proceed. Draco stood up, uncertainly, and then kissed him. Harry dried them off magically, and they stumbled through the rooms, snogging until Harry planted him on the bed.