Freefall by Roe Horvat

When his parents try to coerce him into a marriage with an obnoxious, snobbish alpha, Ansel escapes to his granddad’s off-grid cabin. There he can gather the courage to make some tough decisions. After an unusually stormy night, Ansel ventures out to investigate the damage, and finds…a dragon. An actual, live dragon that crashed into the forest. Ansel fully expects to become the beast’s breakfast. Instead, the creature politely greets him before transforming into a naked man and inviting himself over for tea.
At almost forty, Pascal would like to think he’s not reckless anymore. But when he goes flying without checking the weather first, crashes during a storm, dislocates a shoulder, sprains a wing, and lets a human see him in dragon form, he realizes he’s made a colossal mess. To top it off, his dragon-side decides that the little omega must be his mate. A nineteen-year-old sophomore! It’s pure luck that Ansel doesn’t study at the college where Pascal teaches, or he wouldn’t be allowed to even look at him.
A young dragon mate before his first heat is a fragile being, and Pascal needs to tread carefully. Overbearing parents and an evil ex are going to be the least of his problems.
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Freefall is the third book in the Dragons of Ardaine series. The slow-burn age-gap romance features a protective dragon shifter, his sweet mate, and a satisfying HEA.