Imagine that. Jack Harkness needing to hear something like that. In any other mood, Ianto would have teased him. But like this...? Broken as he was and broken as Jack just showed himself to be? Ianto snuggled closer, until he was under Jack's coat along with him and lifted his head so that his lips grazed Jack's ear.
"I love you," he whispered, like it was a secret, too fragile to just be tossed around casually. "I love you. I love you. Only you. I'm scared as fuck right now and it's only okay because you're here. Not because you'll fix it, but because I love you." Ianto shut eyes sore from tears and tried to insert himself under Jack's skin by osmosis.
He was fairly certain that Gwen would have peed her pants hearing Ianto say something like that, back home. This place certainly had changed them.