I love Janto: yep. Drunk Gwen isn't cute? Not that I think she would be cute while drunk.
Jack run his hands up and down Ianto's arms. Ianto couldn't stop shivering, he had ended up having to lead a hostile alien into a freezer. He moved closer and Jack pulled him into a hug. Jack so was warm, comfortable and familiar that Ianto let out a pleasured sigh, not thinking of the Doctor who was leaning against the console and watching them.
Jack kissed Ianto's forehead and Ianto closed his eyes, sinking into the feeling. "I'm going to get Ianto warmed up," Jack said. Ianto was caught by surprise when Jack scooped him up into his arms in one fell sloop. "Where's the wardrobe?"
"Third door to the left," the Doctor answered.
Ianto still had enough wits about him to wonder if Jack was carrying him into the wardrobe. Jack went right and carried Ianto into their room.
"Warming me up?" Ianto asked with a smile. Then he curled his arms around himself.
Jack smiled back softly. "We'll make sure your parts don't fall off before doing some more fun warming up," Jack promised. Jack lead them to the en suite bathroom and carefully sat Ianto down onto the sink. The TARDIS had been kind enough to provide a hot tub for them. "I'm going to need your clothes. Your suit is frozen."
Ianto could feel his face heat up. He sat up and fumbled with his tie, but his fingers were too numb. Jack pushed him back down and began undressing him.
"You'll feel much better after a hot bath," Jack said in a low voice. "I'll get you some dry clothes." Ianto kicked off his shoes and fumbled with getting his pants off.
Once Ianto was fully undressed Jack wasted no time in picking Ianto up and depositing him into the hot tub. Ianto yelped in alarm at both the sudden movement and the sudden heat. Jack picked up Ianto's clothes.
"I'll be right back." Ianto watched Jack leave. He closed his eyes and let himself drift off into a light sleep.
Ianto was awaken from a vague dream about hot springs by Jack running his fingers through Ianto's hair. I should get frozen more often.
"Hey I found us PJs and..." Ianto cracked an eye open. It was the longest and most hideous scarf he had ever seen.
"We are packing clothes next time," Ianto deadpanned. Then he grabbed Jack's collar and pulled the immortal down. "I believe we need to check that certain parts are still in working order."
Ianto was almost surprised that Jack bothered to take his clothes off, given how quickly Jack jumped into the hot tub.
I'm not sure how one safely defrosts someone but lets say Ianto warmed up enough before hand that a sudden hot bath won't shock his system.