Izdahl and Armando become frustrated with each other, in The Architect’s Guardian, Chapter 24. Here’s a portion:
“If you’re going to be angry with me all night, I’ll sleep in another room. I can’t be next to you and not at least hold you.” Izdahl hesitated. He was unsure if he should say the next words on his mind. However, after a few moments of indecision, he decided to be straightforward. “We haven’t exactly been all that intimate lately. Don’t eliminate the little bit of intimacy we do have.”