Is this my new favourite Ali Hazelwood book? Possibly, yes! 
Deep End is a spicy college sports romance with a side of STEM and I am so here for that! I found Deep End so easy to get into and really enjoyed getting to know Scarlett and Lukas. I liked how much we got Scarlett's own story and relationship with diving, as well as having that STEM link we all love in an Ali Hazelwood book. Lukas was a great main character, one of my favourite of her MMCs! The spice was on point - definitely her spiciest story so far and I loved it!
I had a few slight issues with

Lukas and Pen's relationship

but was happy with how it was eventually resolved.
Would highly recommend and I already want to reread it!