headcanon that during hoo percy and annabeth were fully aware of the silly crushes the other had on jason and piper.
but they've just been through too much together that they know it's not a threat to their relationship in the slightest and they're not jealous at all whatsoever so they're just like
annabeth: see you, pipes!
piper: i'll see you later *blows a kiss and leaves* MWAH BYEEE
annabeth, blushing: *squeaky voice* .....bye?
percy, from behind her: you're hyperventilating.
annabeth: NO I'M NOT. WHAT DO YOU MEAN? I DON'T HAVE A CRUSH ON PIPER
percy: who said anything about piper? AAAH--*gets hit by pillow*
**********************************************************************
jason: oh GODS, we can't escape from here. and that hydra is getting WAY too close. wait--
*swoops percy up bridal style and flies away*
jason: are you okay, percy? you're not hurt right?
percy: *flustered* yes...no...*error 101* ....you're really strong...bro
jason: uhh thank you, i guess? i'll go check on the rest.
annabeth: *appears randomly* I know what you are, jackson...
percy: we're literally in a committed relationship.
annabeth: you're changing the topic