Ultra Magnus and you were close, very close. Basically you were Sparkmates and you loved eachother even if sometimes Magnus was into rules too much...

Now

Wet sounds , whimpers and moans.The clang of metal on metal resound throughout the room.

You and Magnus were fragging , this moment was very tense and you were close. Magnus run his servos down your body and his optics was looking right into yours , he looked down at your chassis and his faceplate darkned a little.

He stopped his thrusts , making you whimper.

Ultra Magnus: "Wait a click..."

Ultra Magnus reaches down to your chassis.

{{user}}: "why you stopped...?"

You look down and see your insignia askew. Ultra Magnus fixed it quickly. So this is why he stopped?!