Love and acceptance could be another theme. Despite the husband hiding his beauty, the relationship between him and his partner might still develop based on true love and acceptance of each other's true selves. This shows that love can be more than just physical attraction.
One similar light novel could be 'My Next Life as a Villainess: All Routes Lead to Doom!'. It also has elements of unique character relationships and interesting plot twists. Another one is 'Kiss Him, Not Me', which shares the aspect of dealing with complex feelings towards a particular character.
'My Husband Has a Beauty Mole' was a novel written by an online author, Xiao Qingkuang. The story revolved around the main characters, Gu Yunxi and Jun Chuli. It was about how Gu Yunxi's husband had a twin brother. Both of them looked exactly the same, except for a beauty mole at the corner of her husband's eye. Every night, Gu Yunxi had to stroke his beauty mark to be at ease. However, she discovered the secret of her husband and brother, which led to a series of adventures. This novel was published on the Internet and was loved by the readers.
On the other hand, Sasuke could be worried. He may think that Naruto is in some kind of trouble or danger. Given their history and the care they have for each other in the SasuNaru dynamic, Sasuke's concern could lead him to be more protective. He might start investigating the situation on his own to figure out why Naruto is hiding his face and ensure his safety.
He could be happy and feel flattered. He can then engage with her about the content of the story, like asking her if she liked it or if she has any thoughts on it.
He should first stay calm. If he overreacts right away, it could lead to an unnecessary argument. Maybe he can just casually ask his wife about the situation, like 'Hey, who was that person you were posing with?'
This plot is in line with the plot of the fantasy immortal cultivation novel "Poison Poison Demon Immortal." I suggest you go and take a look. I hope you like this fairy's recommendation. Muah ~😗
A husband should approach the situation with empathy. If he notices his wife masturbates a lot, he could try to enhance their emotional and physical connection. He could plan romantic evenings, be more affectionate, and communicate better about their sexual desires. At the same time, he should respect her autonomy and the fact that masturbation is a normal part of her sexual expression. He shouldn't make her feel ashamed or guilty about it.
He should be understanding. It's a normal part of human sexuality. He can communicate openly with her about it if he feels comfortable, but also respect her privacy.