BL find pls

PLEASE PLEASE PLEASE HELP ME FIND THIS BL BOOK WATTPAD:

Xander x Elias

Reversible couple
MC transmigrated to Xander body
His sister also got transmigrated to one of Xander's ex

MC transmigrated to a book he read for fun

the book MC reads: F boy Xander, Innocent girly nerd, and Elias

Innocent girly and MC with Elias are all bff's