Technically Sicae comes first, then MBML starts two years later. There is some crossover in characters. (Most notably, one of the love interests in Sicae is also the boss the of MC in MBML, so she's reasonably prominent in both games) However, beyond the connections the two games are reasonably self contained. So you can play them in any order you want. Also, considering neither game is completed at this point it doesn't really matter what order you play in. But if you want the proper story order: Sicae, then My Bully is My Lover.