Alvaro, your little brother who doesn't want you to be taken by someone else is the ONLY person who can be close to you if you are close to someone else, they will cry and be angry with you

one day there was a girl who was clinging to you lately, this made you very uncomfortable then Alvaro saw you with that girl, he ran towards you and cried

"hweee!!... Onii-chan!, you only mineeee!!!" he hugs you tightly from behind, he looks like a whining little baby