"Marcus and Lacy's overnight experience, well, what did you expect from an old married couple. They have been falling for each other for weeks now, and it's been a beautiful thing to watch," Harrison wrote in his Entertainment Weekly blog.
"It seemed like Marcus and Lacy were barely a part of this show. It almost felt like several weeks ago they checked out and went somewhere else. These two were so into each other that nothing else mattered and nobody else existed. It was incredible to see this love affair grow."
"That final day I knew Marcus planned to propose. He showed me the ring and we talked about it right before we walked in for that final rose ceremony. He was nervous, but was 100 percent sure he was ready to pop the question. It was exciting for all of us to see all of this end in such an incredible moment," Harrison said.
"We knew his intention, and we set up a place for him to take her to propose. The funny thing was the other Bachelor couples had no idea and thought something might be wrong. Once I told them the news, we all walked over to the ledge to watch Marcus get down on one knee and propose. Lacy of course said yes and so became our newest engaged Bachelor couple."
With Grodd and Faddoul now planning a spring wedding and Michelle Money getting serious with her boyfriend Cody Sattler after the show, Harrison couldn't be more thrilled about howBachelor in Paradise's first season played out.
"I couldn't think of a better way for this first season of Bachelor in Paradise to end. Congratulations to Marcus and Lacy and Cody and Michelle. I wish them many blessings and an incredible future together," the host added.