Maureen was always touching, always caressing and stroking his hair, his face, his shoulders, his back, and it may have been why he put up with everything else she did for so long. Mark loves physical contact. He loves intimacy. Closeness. Arms around shoulders, hands on arms, knees touching under the table kind of closeness. He's a sucker for it, and he knows it. He loves being close to Roger, because Roger loves being close to him, because Roger does all of those things without even thinking, because it's almost not natural for them not to be so close.
He almost has a heart attack when he feels someone climbing into his bed next to him, and so he kicks and jumps away before he's even completely awake.
"Jesus, Mark, calm down. It's me, it's Roger, it's okay." His words are curt, but his voice is soothing, placating. "You alright? Sorry. I didn't mean to wake you up." Mark mumbles something in response, trying to form coherent sentences. "I can leave if you want," Roger adds. "It's just cold, you know. You're shivering too." Yes, Mark is keenly aware of that, and he's aware of how futile it is to try to get deeper under the covers, because that's all there is, but he's still been trying whenever the cold wakes him up.
"No. Stay." Even he can hear how pitiful he sounds right now. Normally he's in control, but he's so sleepy and so cold right now it's impossible. He lets Roger help him rearrange the blankets and the sheets and the pillows, lets him add his own to the pile, and they get in bed together, and now his brain is fully functional and trying to catch up to the situation, and is content to leave it alone.
Mark loves being touched, but he loves touching a little more. He'll cuddle with anyone - all they need to do is ask. Most people don't. He takes hugs and kisses on the cheek, but is rarely able to give them back. Roger's the only one who doesn't move fast enough.
Despite that, he doesn't really mean to curl around Roger the way he does. Maybe he's just used to cuddling with people in his bed. Maybe it was a way for him to get warmer. But one moment they're shoulder to shoulder, knee to knee, and the next moment Roger's twitching wakes him and he realizes just how much closer they are. Sharing body heat with someone is probably about the most intimate one could become with someone else, short of sleeping with them. Well, fucking them.
Soon he's asleep again anyway, and the next morning when Roger is gone he can't explain why he should feel colder than he was last night.