Twitter is heart-eyes emoji for Mark Cadiz, a college-aged dude who swapped shoes with his girlfriend when she forgot to wear closed-toe shoes to her chemistry lab midterm.
If his girlfriend, Vanessa, had gone to chem lab in sandals, she wouldn't have been able to complete the lab work, which would have affected her course grade. Luckily, Mark stepped in (literally) and wore his bae's shoes while she completed the lab in his sneakers.