Who cares about the challange when your wife ask for a kiss? Nah, lets doubt her, speak loud so your child wakes up, you dont have to kiss anymore.He's not embarrassed to kiss his wife he just embarrassed about getting caught planting a surprise for her and then thinks she's pulling something on him by making it a challenge that's why he stops, and can't figure out if she's joking about being asleep or not. Then he is worried about getting caught out of bed with presents ruining the illusion of Santa for his daughter so he gets back in without kissing her. Please could some of you learn to read social situations...
Finally someone with functioning braincellsI'm not sure what you people are expecting from this manga. Do you not realize that Chi is, like... right there? In every chapter?
Say we have a chapter in which Chi's not around and Nishikata straight-up shoves his tongue in Takagi's mouth. However satisfying that might be to watch, I don't think it would have much to do with the theme. This is a manga about Takagi teasing her husband and daughter, much like the original.