The person mentioned in the commentary is ambiguous (no gendered pronouns), but without going into Sakura's current relationship status (it's a bit complicated), I think it's most likely Azumaya because:

• Azumaya has a thing for maids (post #7077850).
• Sakura probably wouldn't refer to her (ex?) girlfriend as あいつ (that guy).

Or maybe I'm overthinking things and it's just referring to the viewer.