It has and it's cute since the animals are usually the ones pairing up. But Sejun has a love life too, don't worry, judging from the spoilers, it doesn't hurt the plot.
No they did it the 1st time when Loneal was having horny effects while doing magic to meet his club quota. Then they did it again during their vacation when they found that fountain thing that gave Alec water powers.
I love their skinship. Can't help but cry bcuz I feel so sorry for the kid. hope he finds happiness and our couple can be his 2nd parents not legally but you know what I mean like a guardian.
The baby brother is so cute . I'm sad this ends .