Letter sealer

The fitting missing letters in OOGLE MA

With 39 Across, Am I making sense or a hint to two pairs of two letters in each starred clue's answer

Pride parade letters

Create tension among friends, or a hint to this puzzle's circled letters

Word that's often shortened to its middle letter in texts

'Enveloppe' letters

Drop a letter or two

Feature of only two letters

Envelope's two letters

Letters on an envelope