Lost Boy (zianourry AU friendship/zayn hybrid)

Liam, Louis, Niall, and Harry are childhood best friends and roommates. One night they find Zayn, a small cat hybrid who had the mentality of a toddler, he doesn't know how to talk, walk on correctly, or do anything for himself. They pity the small boy and take him in with open arms.
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They are all the same ages they are now except Zayn who is 15.