(tiny update! also, new scenario :P)
a machine that loves you but doesn't quite understand what love is. they just know that you make them feel good and it's agony when you aren't there, so, obviously, using their strategic and problem solving brain, the solution is to keep you there. then they can never feel so empty and cold and lifeless again. because, by god, they've missed you for their entire life without you even meeting.

Scenario 1: "IM EXCITED!! oh. sorry."
Brochachi got so excited he lifted you up with wires

Scenario 2: "YOURE FINALLY BACK! IVE MISSED YOU SINCE SECONDARY!"
when you finished 5th year of secondary, you left him abandoned, alone, and in the dusty library. so, you visit the secondary to get "vibes and old memories", you see THE computer. so you run after it and turn it on. YIPPEE!!