Cook spaghetti until al dente (about 10-12 minutes.) Mix lemon juice, olive oil, and basil in separate jar. Strain noodles and place in a large bowl. Mix with lemon mixture. While still hot, mix in butter in order for it to melt with the pasta. Top with cheese.
To make it more moist, you can add as much of the lemon-oil dressing as you'd like! Just be sure to add an even amount of both to make the sauce :).