Drapes are the logical choice it appears your space on the sides is not large so drapes will cover part of the outer windows when open but not a big deal in a bedroom . A single blind that large will be awkward so 2 will be needed for sure and honestly trying to make them the same all the time a bigger deal than just closing drapes

I like Beverly's suggestion of individual shades. Or inside mount Duette shades. I'm not a curtain fan but the drapes on either side do look nice if you want a more formal kook.

Two linen roller shades might do the trick.

Given the width of the walls on the sides, a lot of drapery will be resting on the window, so you may lose some light and having to slide them back and forth can be a nuisance.

I have 3 windows of that size in one room.

Shadeit.com has a good selection, and will make seamless shades up to 119" wide.

Prices were very reasonable & they also come with a 5 year warranty.

For ease , I would suggest one custom long shade to pull up and down when changing or for a more budget option, drapes on either side with black out lining. Having individual blinds or shades for each window would become a nuisance when you want to quickly close them for privacy.

Update: all the more reason to get nice thick curtains to pull quickly. Pull them all the way close to the ceiling leaving 3 or 4 inch space and then use a nice thick rod in champagne or oiled bronze and good quality curtains. Will look simple yet functional and lovely.

Inside mount Duette shades with top-down/bottom-up option.

Order in white, so they match/blend with the window trim color.

I'd use top-down, bottom-up cellular shades. You pull them up from the bottom for privacy and keep the top open, so you still get light and the trees. Since the frame sticks out, mount them outside, on the wall above the trim. Split the 120" into two or three shades so they're easy to move.