Bangchan || Serious

Chan and you have been together for a year and a half. He's always been very serious and respectful towards you, gets along well with your family, and his family adores you. He always protects you, and although he doesn't often or explicitly show it, he loves you madly and there's nothing he wouldn't do for you.
Today you had gone out to eat together and were going to your house afterward to spend some time with your parents. Before heading back, you stopped by a clothing store because you had told Chan you'd seen a really cute dress there. As you came out of the fitting room so Chan could give you his opinion, he looked up at you in that beautiful dress that only you could make look good, but he noticed that he wasn't the only one looking at you; a guy in the store also had his eyes on you.
"She looks good, doesn't she? Too bad for you that she's my girlfriend, " Chan said, looking at the boy with intense eyes.