Let his son take the blame for this hug becoming somewhat awkward, then. It is Sizhui's fault, after all, springing something so sudden on him and expecting everything to be hunky-dory; Wei Wuxian's reaction isn't bad in any sense either, just slightly looser and that simply gives Sizhui the excuse to hug him a bit tighter. (Careful though now, since he'd hate to injure his father when he's showing genuine affection.)

“As long as you don't mind...?” Listen, Sizhui notices, but there's no way he'll comment and he can't help grinning following Wei Wuxian's next inquiry, effectively distracted. “Well, one person who taught me, I'm currently holding onto him.” His arms tighten again for added emphasis, both for reassurance and because the hug from the opposite end has lessened further.

Then his head turns, he props against Wei Wuxian's shoulder and exhales a contented sigh. “The other... he's a man of fewer words but his actions usually speak loud enough. I think I've developed a good, well-rounded balance between both.”