A trumpet vine (Campsis radicans) enveloping a yew bush and bursting into radiant flower on the north side of Sunset Hills Road just west of its intersection with the W&OD bike path and east of the Reston post office. See this Missouri description, this Wikipedia article, and this Virginia Tech fact sheet.
Meanwhile, fruit (in the form of raspberries) are starting to set on the blackberry plants (Rubus spp.) that were blooming about a month ago, as shown in this post. This particular specimen is located on the north side of the W&OD bike path just east of its intersection with the Oak Hill Christian School driveway.
Similarly, fruit (i.e., cherries) are beginning to develop on the black cherry trees (Prunus serotina) that were also in bloom about 5 weeks ago, as shown in this post. This plant is located along Sycamore Valley Drive.
Finally, fruit have appeared on mulberry trees, such as this one on Sycamore Valley Drive. Given the glossy upper surface of leaves (which are not lobed, as befits an older specimen), this appears to be white mulberry (Morus alba, see this Wikipedia article, this Morton Arboretum page, and this Virginia Tech fact sheet), the host of the silkworm in ancient China, or one of its many hybrids, rather than the native red mulberry (Morus rubra, see this Virginia Tech fact sheet). Regardless of specific identification, any mulberry tree is easily identifiable by the mess left by the easily squshed fruit on sidewalks beneath them.